HDR+ Icon gone

Hi guys...
I have my Nexus 5 for 2 months and I am using the newest version of Android Kit Kat (OTA) and stock..
The problem is, the HDR+ icon is gone, can't use this anymore (I've used this 2 weeks ago), tried to clear data/cache of the camera APP , flash is off, still no icon...

Clear data/cache of camera app and reboot the device. If this doesn't help then, Open the camera app and touch and hold anywhere on the screen for a few seconds ... 4 options would be displayed there which includes the HDR+ option as well.

Clear data/cache of camera app and reboot the device. If this doesn't help then, Open the camera app and touch and hold anywhere on the screen for a few seconds ... 4 options would be displayed there which includes the HDR+ option as well.

Thanks for helping
Did everything as you told me... no luck =(

Tried to touch and hold the screen in the camera app and I can 4 options which are exposure, more options, flash mode and front camera but still no HDR+ icon

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